This standard aims to establish a method for determining the tensile properties of nanostructured films (which have important applications in fields such as conductivity and thermal conductivity) with both length and width less than 100 mm, addressing the lack of unified standards for such small-sized samples. It specifies in detail the principles of measurement, apparatus, sample preparation, testing procedures, and the calculation and presentation of results. As a foundational standard in this field, it unifies key testing conditions such as sample dimensions, clamping methods, and loading rates, ensuring the accuracy of mechanical property characterization. When testing is conducted in accordance with this standard, the core instruments are micro-force material testing machines or micro-nano mechanical testing systems, which typically require high-precision force sensors and specialized clamping fixtures suitable for films.