The present invention relates to a kind of heat sterilization compositions, including:The protein source of 5% to 20% amount by weight of the composition, the protein source include protein hydrolysate;The wherein described protein source is handled in the continuation method using at least one endopeptidase, typically lasts for the time of finite length.In addition, the present invention relates to a kind of heat sterilization high protein compositions with low viscosity and without bitter taste, include the endopeptidase of hydrolysis temperature-sensitive protein source and at least one heat inactivation, the hydrolysis temperature-sensitive protein source has 20% to 50% protein degree indicated with NPN/TN.The invention further relates to a kind of continuation method being used to prepare heat sterilization composition, the composition includes the protein source containing protein hydrolysate, be the described method comprises the following steps:(i) aqueous solution of protein source is provided;(ii) continuous hydrolysis step is carried out, wherein handling the aqueous solution of the protein source by 40 DEG C to 90 DEG C heating and continuing the time of 2 minutes to 20 minutes finite lengths using at least one endopeptidase;(iii) make the endopeptidase heat inactivation.The invention further relates to a kind of viscosity of control heat sterilization high protein composition and the method for preventing its bitter taste, the method includes providing the aqueous solution of the aqueous solution of protein source and the protein source described at least one endopeptidase continuous hydrolysis, then make the endopeptidase heat inactivation.Finally, it is used to prepare heat sterilization composition the present invention relates to protein hydrolysate and/or the purposes of viscosity for controlling liquid composition, the protein hydrolysate is prepared in continuation method as described herein by the time for handling finite length at least one end
