Robert Xie is charged with killing his Chinese-born brother-in-law Norman Lin, Lin's wife Lily, her sister Irene, and two boys who cannot be named for legal reasons.
The family were found dead in their beds in July 2009 in a case that shocked the nation.
It was Xie and his wife Kathy Lin who discovered the bodies and called police, sparking a mammoth investigation spanning Australia and China.
Xie was eventually charged in May last year and in Sydney's Central Local Court Wednesday, Magistrate John Andrews decided there was a compelling enough case against him to take it to a jury trial.
Police allege Xie was motivated by greed and jealousy and stood to inherit the Lin family's news agency.
During committal proceedings, the defence argued the case was based almost entirely on speculation.
"The jury may well find there are inconsistencies and varying answers given by the defendant and (his wife) Kathy Lin," said Mr Andrews.
However, a jury could also find those answers were given in "highly strained circumstances", the magistrate said.
The jury might also not accept the DNA evidence against Xie put forward by the prosecution, he added.
But ultimately, Mr Andrews said it was a case that a jury should decide.
He said it was not a matter in which it could be said a "reasonable jury would reject the case".
He said he would allow Xie to apply for bail ahead of his Supreme Court arraignment on February 1 next year.
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