methods Tweenty cases of pineal region tumors were resected by infratentorial supracerebellar approach in the patients taking sitting position.

Three dimension finite element analysis of the stress distribution on sacroiliac joint surface in sitting stance;

The signals of lumber erector spinae,thoracic erector spinae?rectus abdominis in relaxing sitting position,forward sitting position?backward sitting position were collected.

The main technical problems in registering detection software were discussed,which includes pixels obtained method,the setting of the pixels size,determination of the marks end coordinates,treatment of the overprinting dots,the identification of the registering marks in various background.