Li Quan had already understood the production of coal, and he couldn't sit still now, so he immediately set off back to Chang'an.

And Illinois has not changed because of his departure, but has become busier.

A large amount of wool is being transported back, and at this time, the merchants from the outside world still don't understand the use of Situ Changfeng to collect wool, but they can make money for nothing, and they are all running around happily.

Yizhou's days are getting better and better, and its reputation is gradually spreading, the workshop and mine are now on the right track, Situ Changfeng finally doesn't have to run around all day, stay in the city with peace of mind, and always pay attention to urban construction.

Ten green brick kilns built by the mountain burn all day long, and one kiln brick comes out in ten days, and the first thing to build is the city wall.

The entire city wall was built with bricks and volcanic ash mixed with sand, and the sand was everywhere in the Gobi Desert, and the volcanic ash was pulled from an extinct volcano in the Gobi, and the road was long.

Fortunately, the herdsmen are not short of horses, and under the heavy reward of Situ Changfeng, they are still brought in an endless stream.

With the completion of the city wall, Situ Changfeng, who had been in Yizhou for almost five months, finally let go of the big stone in his heart.

With the city defense, at least there is no need to worry about the harassment of horse bandits, etc., even if the Turks attack and hold for a while, they are still confident.

Seeing that in autumn, the Gobi Desert is getting cooler day by day, and the construction of private houses is also on the agenda, and according to the plan, the gradual reconstruction has begun, and the people only need to pay off their debts with work, and they can be assigned a small courtyard.

Although it is said to be a small courtyard, it is only a house built, built of blue bricks, and built with a fire kang.

The kang is connected to the kitchen next door, and as long as you burn coal, you can warm the kang, and you can usually put a pot of water, you can enjoy hot water at any time for washing and bathing, which is simply great.

The people of Yizhou are the first beneficiaries of coal production, and Situ Changfeng will not let the people under his rule become charcoal sellers.

As long as the people are doing things for the government or their own workshops, they can receive enough coal for free every day, and the rest of the people who want to buy it can buy it for only one copper coin.

Of course, the Turks, who did not contribute to the government, the people of the Western Regions, wanted to buy it, and it was much more expensive.

Situ Changfeng's move deserved the support of the people of the whole city, and no one thought that life could be so warm.

Many people even set up an immortal archway for Situ Changfeng, which made Situ Changfeng's reputation a little longer.

Just when Situ Changfeng was busy, Li Shimin was meeting Li Quan.

Chang'an City! Reizheng Palace!

"It's made of wool?" Li Shimin stretched out his palm, rubbed a woolen coat worn by ordinary people in front of him, and asked with a raised brow.

"Back to Your Majesty, Weichen witnessed the entire production process with his own eyes," Li Quan said respectfully without raising his head.

"That's a lot of work! Your Majesty, wool is just a useless thing, but it can be easily made into clothing, not only can the treasury have a large amount of income, and there will be no one who freezes to death in the Tang Dynasty in the future. The eldest grandson's eyes lit up and he said excitedly.

"Weichen congratulates Your Majesty, this is an unprecedented thing, completed by Your Majesty's leadership, Your Majesty far surpasses your ancestors, Weichen congratulates Your Majesty." Li Quan said loudly.

"Haha! It seems that they all think that this is a good thing, so according to Situ Changfeng's intentions, notify the rest of the families to contribute, and Li Quan, you will handle this matter. Li Shimin laughed, nodded happily and said with a smile.

"Wechen obeys!"

"This Situ Changfeng is really interested in his son, and he is a qualified master." After Li Quan left, the eldest grandson said with a smile.

"Guanyin, you only see one of them, Situ Changfeng's move is good for his son, it also means that he has no dissent, and at the same time he is good for several others, and more importantly, I have to pay attention to Yizhou, send personnel, and support troops." Li Shimin explained with a smile.

Although he saw through Situ Changfeng's intentions, he didn't get angry because of it, because it was just human nature.

"This Situ Changfeng is also a flexible person, and he doesn't look like a general." The eldest grandson said angrily.

"Second brother and sister-in-law, who are you talking about? Someone dares to make your second sister-in-law angry, and the younger brother tears him up! A man with a huge skeleton, but who looked thin and had a sickly yellow face, entered the hall and said loudly.

"Shiro, how can you be willing to walk out of your small courtyard!" Li Shimin asked in surprise.

"Hehe, the little brother is still thinking about it, and I want to come to see the little son, so I came here with the second sister-in-law." The person who came was the first master of the Tang Dynasty, Li Yuanba, the king of Zhao in Xifu.

"Fourth uncle! Fourth uncle! At this time, the little son was finished playing outside, and was brought back by the palace maid, and when he saw Li Yuanba, he shouted happily and stretched out a pair of small hands to hug.

"Ahh Li Yuanba shouted happily, opened his big hand, as if holding a rare treasure, carefully picked up the little son, smiled on his face, and grinned with a big smirk.

It's strange to say, Li Yuanba is not a woman, he only loves to practice martial arts, fight, and has no heirs when he gets married, and he is usually extremely indifferent to people, even his only apprentice Li Tai, is the same, but only for the little son, he loves him very much.

"Huh! Hehe! Li Yuanba gently picked up the little son, and turned around twice with a smile, making the little son giggle.

"Fourth brother, don't spoil her, she's almost lawless now, playing crazy everywhere every day." The eldest grandson said dotingly at the two who were playing.

"Crazy! The little son's body is weak, how can she be allowed to move vigorously, isn't this ......" Li Yuanba heard this, and immediately said with a little blame.

"Hehe, fourth brother, don't worry, this is because my brother didn't make it clear to you, my son took the medicine given by her master, and wore the warm jade of the earth's heart, and her body is much better, didn't you find that her voice is much louder?" Li Shimin hurriedly explained.

"Oh, my son has apprenticed? I don't know who it is? Li Yuanba relaxed and asked.

"I don't know the fourth brother of this person, but it is Luo Cheng, the Duke of Tanguo, and the junior brother of the spear god Luo Song, named Situ Changfeng." Li Shimin introduced.

"Oh, there's a chance to see it!" Li Yuanba nodded and said, then turned his head to observe the little son.

"I'm afraid that the fourth brother won't see him for a short time, but at present, this person is being arranged by the Martial Arts Academy to guard Yizhou!" Li Shimin said with a smile.

"Second brother, how can you let your son start practicing martial arts now!" Li Yuanba asked with a frown.

"What?" Li Shimin was stunned for a moment and asked, for Li Yuanba to say that the little son practiced martial arts, he felt that he had heard it wrong.

"Huh! Fourth brother, you say that your son practices martial arts? How is this possible, neither you nor your second brother know about it! The eldest grandson also shook his head and said with a smile.