Masu, a native of Yicheng, Hubei, is Ma Liang's younger brother. When Liu Bei was in Jingzhou, he followed Liu Bei. But Liu Bei thinks that "Ma Su is too big to use". As a result, Ma Su didn't get any promotion in any important position before Liu Bei died, but was only a small official in Shu Han. Later, after Liu Bei's death, Zhuge Liang refused to listen to Liu Bei and appointed Ma Su to join the army. It can be said that Zhuge Liang is very grateful to Ma Su. At first, Ma Su did not meet Zhuge Liang's expectations. When Zhuge Liang went south, Ma Su gave Zhuge Liang advice.

Zhuge Liang accepted his policy, pardoned Meng Huo, won the hearts of the people and put down the rebellion in the south. No, Shu is short of talents and excellent employees. Ma Su is not Zhuge Liang, because Ma Su is too overbearing, and the Lost Street Pavilion is one of him. Setting Ma Su as Zhuge Liang's street pavilion is the throat for the Shu army to attack Wei and a battleground for military strategists. Zhuge Liang knew that Sima Yi would win the street pavilion. At this time, Ma Su was just a counselor, with no outstanding military achievements, and was often laughed at by soldiers. If he can hold the street pavilion, on the one hand, he can consolidate his position in the army, on the other hand, he can make great contributions in the war. As a result, Ma Su made a written pledge to fulfill a military order, but after the defeat, he was martyred and put his whole family's life on the line. Zhuge Liang assigned him fifty thousand chosen men and another lieutenant. Ma Su went to the street pavilion, but he didn't do as Zhuge Liang asked.

Moreover, General Wang tried many times to dissuade him, but he wouldn't listen. Drive the camp up the hill. At this point, Sima Yijun cut off the water first, and then released Yamakaji. Ma Su was defeated and failed to hold the street pavilion. Since Zhuge Liang attacked Wei, he has conquered three cities.

Every soldier is advancing, and every soldier is doing his best. Ma Su Street Pavilion kept Zhuge Liang's 300,000 troops stuck. If Zhuge Liang hadn't been wise and decisive, the 300 thousand army would have been wiped out. Ma Su is also Zhuge Liang's best man, but he doesn't have the heart to kill him. When he was about to kill him, he remembered what Liu Bei had said to him. Ma Su is a boaster and has no time. At this time, Zhuge Liang wept bitterly.