Article 20 of the Inheritance Law clearly stipulates that "a will must express the true will of the testator, and a will made under duress or deception shall be null and void. A forged will shall be null and void. If a will is tampered with, the tampered contents shall be null and void.". The content of the testator's will is to dispose of his own personal property legally owned during his lifetime. If the testator makes a will under the pressure of external factors such as coercion, or if the will is tampered with or forged, it is the intention of others. Others have no right to dispose of the property owner's estate. Only the estate owner can dispose of his own legally owned estate. Therefore, A will must express the true meaning of the testator, which also reflects the protection of the property owned by citizens.