Three men have been charged in Western Australia after they allegedly kidnapped a man for two days, assaulted him and demanded money from his family.

Police say the 68-year-old alleged victim travelled from China to Perth but stopped in Melbourne where he met with a 29-year-old about a proposed business deal. The two then flew to WA on April 23.

When they arrived in Perth, police allege an associate of the 29-year-old drove the pair to a house in Caversham, where a third man was waiting.

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"It will be alleged the 68-year-old man was subsequently held against his will and assaulted a number of times," Western Australia Police said in a statement.

"It will be further alleged members of his family were also contacted, requesting sums of money for his release."

Police said they found the 68-year-old's location and forced entry to the Caversham house.

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"The man was found inside the house with various injuries, and was conveyed to hospital for treatment," they said.

A 29-year-old, 37-year-old and 31-year-old have each been charged with kidnapping and demanding property by written threats.

The 29-year-old and 37-year-old are due to face Midland Magistrates Court again next month.

The 31-year-old man is due to appear in Perth Magistrates Court today.

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