Zhang Ruitu was good at painting landscapes and calligraphy, and changed the ancient methods with his pen. He broke the rule of Fiona Fang's pen combination in one fell swoop and pushed the application of Fang Bi to the extreme. His pen and pen are hard to fold, and it seems to have a fatalistic force. He is known as "King Kong" and is also known to the world together with Dong Qichang, known as "Zhang Nan Dong".
Zhang Ruitu's works, with twists and turns, are mainly Fang Bi, which is very simple. Under this premise, it is very difficult to create calligraphy works that conform to the literati's aesthetics.
It is far more difficult to deal with changes with a single stroke than with two strokes, so the creative point in his works is not a simple Fang Bi change, but a clever use of brushwork and word formation, so that the outline of each word in his works presents a ghost angle.