Abstract: reviewed of Twenty four smooth muscle tumors an a ltempt to def ine crite ria a the the gastrointestinal tract are in the agnosis According to observations. indi tumors tumo rusef u1 size under microscope(>6crn)，cellular and electron microscope, mitotic rate(1 /IOHPF)atypia and tumor necrosis are found to be the most the invasive and metastatic be for of the indicato rs of malignancy besides the tumor.The diagnosticcriteriafordiagnosisofleiornyoblastoma.leiomyosarcoma can also behav-applied to