Objective: To explore the feasibility and method of real‐time shear wave elastography (SWE) to evaluate the elasticity of the biceps brachii under different tension states. Methods: 100 healthy young people were enrolled, including 48 males and 52 females. SWE technology was used to measure the Young's modulus of the right biceps brachii muscle at different flexion angles of the elbow joint (0 °, 45 °, 90 °, 135 °). Compare the Young's modulus of the biceps brachii with different bending angles and different weight holding conditions. Results: Under the same flexion angle, the difference in the Young's modulus of the biceps brachii muscle under different weight‐bearing conditions was statistically significant (P <0.001). The elasticity values of each group increased with the increase in weight; The difference in Young's modulus of the biceps brachii muscle at different flexion angles was statistically significant (P <0.001). The elbow flexion was highest at 45 ° and the elbow flexion was lowest at 135 °. Conclusion: Real‐time shear wave elastography can quantitatively reflect the elasticity of the biceps brachii in different states. The Young's modulus value increases with increasing muscle tension. The elbow bending angle is one of the factors affecting its elasticity.