The radiological finding, pulmonary ventilatory function test data, electrocardiography data were used for the study of relationship between these variables in cor pulmonale and normal group in coal Workers pneumoconiosis. The hospital records of 674 men who were diagnosed as coal workers pneumoconiosis were analysed. The ratio between interhilar distance and thoracic transverse diameter was used as a criterion in grouping of cor pulmonale. If. the ratio is greater than 0.36, it was classified, to cor pulmonale. The squared canonical correlation of pulmonary function variable to cor pulmonale grouping was less than 0.15. Logistic regression analysis with pulmonary function variable and electrocardiographic variable showed sensitivity 50.5%, specificity 72.2%, correctness 62.2%. Vital capacity and Forced vital capacity showed significantly decreased value in cor pulmonale group after adjustment of covariates( age, degree of dyspnea, pack-years of smoking, perfusion of small and large opacity).