"on own choice" is correct and usable in written English.
You can use it to refer to an action done of one's own volition. For example: "He decided to move to Toronto on own choice."
It is generally bad news for the patient if his treatment has to depend as much on his own choice as on the superior knowledge of his doctor.
Students have several degree options, depending partly on their academic background and partly on their own choice.
"They're not here on their own choice and they're not urinating on my neighbor's front lawn or soliciting my daughter".
I decided on my own choice," he said tetchily, insisting he had defected with only one precondition, that he not be harmed, or handed over "to some other foreign countries".
Colour Colour can be a hurdle for those unfamiliar with infographic design, and it took me several attempts to settle on my own choice.
Under the current ICT strategy, which lasts until 2015, the FCO CIO imagines the majority of the department's hardware will be bought by the department itself, despite a line that hints "staff will be able to access information where and when they want including, towards the end of the period, on their own choice of devices".
As the last user knows the decisions of all the other users, User C can easily calculate the distribution of n C,k, based on his own choice, r c, i.e., P r n C, k = 1 | Μ C, h C, s C, r C, w = 1, if r C = k 0, o. w.. (9).
So the choosing which movie Chinese children can watch depends greatly on their own choice along with their parents.
Kerry LePage wrote in his 2004 book Some Day Never Comes that he chooses to have a nice day based on his own choice, not that of another person.
Obama cooled on his own choice, Greenwald suggests, as his administration began adopting several sweeping theories of executive power that Johnsen had long opposed.
The task required participants to move a joystick according to two conditions: 1) as cued and 2) based on their own choice.
