Objective:This study is to explore available approaches to selling up a twin registry

which was based on their mental development and status of their mental health. Methods:In order to choose suitable approaches to setting up the twin registu

police

education committee-school and newspaper approaches are compared. Two-step-method is adopted to construct the twin registry. The first step is In collect basic data of twins and the second step is to contact children’s guardians

get the signatures to the comprehending and consent document from the guardians and then bring the twins into the registry formally. Result:The successful recruit ratios of the police approach

the education commiltee-school approach and the newspaper approach are 4%

42.6% and 29.2%. The refusing ratios of the education committee-school approach and the newspaper approach are 57.4% and 70.8%. Then we adopted a series of methods to reduce the refusing ratios. The refusing crowds were contacted again. The re-refusing ratio of the education committee-school approach and the newspaper approach are 31.03% and 55.88%. The overall refusing ratio of the education commillee-school approach and the newspaper approach are 17.82% and 39.58%. Conclusions:Every approach has its own advantages and disadvantages. The available approaches should be adopted to setting up the twin registry according to the characteristics of the research.