Using platina, copper, thermosensitive resistors as sensors together with telemetering instruments ground tepmerature is measured and compared with that measured with standard glass ground thermometers under different weather conditions and sensor disposition. The best temperature observation method for ground and grass surface and at different depth under ground is discussed.The conclusion is that ground temperature should be measured by stick-shaped sensors of small size and,single point sampling should be substituted by averaged multiple point sampling.There is no obvious difference between directly buried and tubed buried. Grass temperature is of great importance to the argriculture service.