根据有机玻璃中超声纵波速度随温度变化的实际情况，阐述了斜探头K值，近场长度和波束指向角随环境温度的变化规律，分别导出了它们各自的数学表示式，可用于实际定量计算，为探伤实际应用提供了理论依据。 According to the actual situation of the P-wave velocity in plexiglass changing with temperature, the changing law of the K-value, the near-field length and the beam-orientation angle of the oblique probe with the ambient temperature are expounded, and their respective mathematical expressions are respectively derived and used in the actual quantitative calculation , Which provides a theoretical basis for the practical application of flaw detection.