Objective To evaluate the image characteristics and quality of MR plain scan with breath-holding in normal lungs. Methods There were 21 normal volunteers to be examined by MR plain scan with breath-holding using T_1WI,T_2WI,PWI fast sequences. It was required to analyze the image characteristics, to measure and calculate signal to noise ratio of the lung parenchyma and the muscle of thoracic wall individually, the contrast and contrast to noise ratio between the lung and the muscle of the thoracic wall. Results On T_1WI,The signal of lung parenchyma was weak and the beating artifacts projected to the lung fields,especially in the left inner and posterior segments. On T_2WI, the lung markings could be seen more, but the noise was obvious in the background and flowing related enhancement appeared in great vessels and heart. On PWI, the signal of lung parenchyma was homogenous and more strong without the beating artifacts of heart and great vessels. According to the order mentioned above, the signal to noise ratio were 1.68?0.21; 2.74?0.26; 4.61?0.79( F =218.06, P