Abstract: In order to study influence of count of spiral line and helical angle on longitudinal cutting head performance,three cutting heads with 2,3,4 spiral lines an d its helical angle were designed based on the same cutting head body by formula of helix,with which pick arrangement were designed and 3D modeling are built compl y with one pick on one line. By study of pick pattern,the definition of pick rotation coefficient and calculation method were proposed,and on the application of pick rotatio n coefficient and cutting load to cutting head performance were introduced. Results of the analysis on three longitudinal cutting head display that the performance of thr ee helixes cutting head was superior to other cutting heads. It was adaptable for rock fragmentation,and could be work more effectively on condition of movement spee d was lower than0.1 m/ s,speed of rotation was between 20 ~ 70 r 1 min. Its working load was steady in rock breaking,average of cutting load was maximum and varia tion coefficient was minimum.