Based on the comprehensive analysis of tungsten and tin mineralization in Nangling,the information favorable for ore formation were Abstracted and constructed by the method of evidence weight in the system of MORPAS.We have predicted favorable areas according to the ore formation probability values.The prediction shows 4 metallogenic prospective areas.Most of the Tungsten and Tin deposits which have been proven were contained by the Guposhan pluton,Jinjiling pluton and Dadongshan pluton.Lianyang pluton has not yielded tungsten and tin deposits.The conclusion of prediction has some indication for further ore finding in this area.The research has shown that the evidence weight model on system of MORPAS is easy to realize and has reliable results and is helpful to increase efficiency and accuracy of mineralizing predication.