In terms of conception, "Cold Food for Brothers in Beijing" expresses the thoughts of brothers, relatives and hometown, which is affection; "Short Message to Friends in the North on a Rainy Night" is about love and expresses the poet's deep yearning for his wife.
On the technique of expression, The Cold Food of Shi Jing Brothers adopts the technique of borrowing scenery to express emotion. The cave in the rain, Yingying on the river, Ling Du grassland and other scenery in the poem are all written around the third sentence "Thinking of brothers for wine", and the artistic conception is created with the help of scenery description. The expression of Notes on a Rainy Night to friends in the north is different. The poet speaks his mind directly, the language is simple, the words are empty, and the cycle is repeated, but it is somewhat subtle and euphemistic and meaningful.