Field experiments were carried out to study relationship between environment factors(evaporation,rain fall, near ground air temperature and relative humidity of orchards,soil temp erature and soilmo isture)and salt accumulation in topsoil in semiarid regions of Qin'an County of Gansu.Results indicate that total salt contents in different soil layers increased with the increase in potential cumulative evaporation amount under the in tegrated effect of environmental factors,showing a positive relationship.With a rising soil temperature,salt accumulation in all the soil layers showed a rising trend.A similar trend was also observed when soil moisture increasedin the soil layers of 0~2 cm,2~5 cm,and 5~10 cm,but a reverse trend appeared with soil moisture rising in the soil layers of 15~20 cm and 20~25 cm.