As the executor of the will, the trust institution must complete all the above procedures before the establishment of the testamentary trust for the division and execution of the estate. A testamentary trust may be established under the following circumstances: the testator designates a trust institution as the executor of the will; The testator entrusts others to designate a trust institution as the executor of the will; If there is no executor designated in the will, or no appointment entrusted to others, the family council shall select the trust institution as the executor; If there is no executor specified in the will, or no appointment entrusted to others, the interested party shall apply to the court to designate the trust institution as the executor. The trust relationship is formed due to the appointment of the testator. His will is regarded as a trust contract and has the same effect. If the trust relationship is established by the order of the court, the order shall be deemed as the trust contract and have the same effect. If the trust relationship is established by the trust institution selected by the family council, the trustor of the family council and the trust institution (executor) must negotiate a contract for mutual compliance. This kind of contract is called executory trust contract. If a will or order has been designated or selected, in order to facilitate the smooth progress of trust affairs, a trust contract can also be attached as a supplement, but the contract shall not conflict with the will or order.